There is no way, because it's gifter's choice.

Read the FAQ, please. :)

dem leechers :-/
Contributors are awesome!

steamgifts plus

Haha

While it is the gifters choice, I am sure a lot of people would want to filter the list of giveaways to offers they can use. On the other hand: a lot of good giveaways with only a few entries could motivate people to start contributing...

Give away a game.

You can't disable it but install add-ons to filter out those giveaways.
Just search it up

SG+

:D

side note: sick display pic of old-school spiderman cartoon's carnage